<template>
  <div class="goods">
    <div class="menu-wrapper" v-el:menu-wrapper>
      <ul>
        <li v-for="(i, item) in goods" :key="i" class="menu-item" :class="{'current':currentIndex === $index}"
        @click="selectMenu($index, $event)">
          <span class="text border-1px">
            <span v-show="item.type>0" class="icon" :class="classMap[item.type]"></span>
            {{item.name}}
          </span>
        </li>
      </ul>
    </div>
    <div class="foods-wrapper" v-el:foods-wrapper>
      <ul>
        <li v-for="(i, item) in goods" :key="i" class="food-list food-list-hook">
          <h1 class="title">{{item.name}}</h1>
          <ul>
            <li v-for="(i, food) in item.foods" :key="i" class="food-item border-1px">
              <div class="icon">
                <img width="57" height="57" :src="food.icon">
              </div>
              <div class="content">
                <h2 class="name">{{food.name}}</h2>
                <p class="desc">{{food.description}}</p>
                <div class="extra">
                  <span class="count">月售{{food.sellCount}}份</span><span>好评率{{food.rating}}%</span>
                </div>
                <div class="price">
                  <span class="now">￥{{food.price}}</span>
                  <span class="old" v-show="food.oldPrice">￥{{food.oldPrice}}</span>
                </div>
              </div>
            </li>
          </ul>
        </li>
      </ul>
    </div>
    <shopCart :delivery-price="seller.deliveryPrice" :min-price="seller.minPrice"></shopCart>
  </div>
</template>

<script>
import BScroll from 'better-scroll'
import shopcart from 'components/shopcart/shopCart'

const ERR_OK = 0

export default {
  props: {
    seller: {
      type: Object
    }
  },
  data () {
    return {
      goods: [],
      listHeight: [],
      scrollY: 0
    }
  },
  computed: {
    currentIndex () {
      for (let i = 0; i < this.listHeight.length; i++) {
        let height1 = this.listHeight[i]
        let height2 = this.listHeight[i + 1]
        if (!height2 || this.scrollY >= height1 && this.scrollY < height2) {
          return i
        }
      }
      return 0
    }
  },
  created () {
    this.$http.get('/api/goods').then((response) => {
      response = response.body
      if (response.errno === ERR_OK) {
        this.goods = response.data
        this.$nextTick(() => {
          this._initScroll()
          this._calculateHeight()
        })
      }
    })
    this.classMap = ['decrease', 'discount', 'special', 'invoice', 'guarantee']
  },
  methods: {
    _initScroll () {
      this.menuScroll = new BScroll(this.$els.menuWrapper, { click: true })
      this.foodsScroll = new BScroll(this.$els.foodsWrapper, {
        probeType: 3
      })
      this.foodsScroll.on('scroll', (pos) => {
        this.scrollY = Math.abs(Math.round(pos.y))
      })
    },
    selectMenu (index, event) {
      if (!event._constructed) {
        return
        // 解决pc端click事件触发两次的问题
      }
      let foodList = this.$els.foodsWrapper.getElementsByClassName('food-list-hook')
      let el = foodList[index]
      this.foodsScroll.scrollToElement(el, 300)
    },
    _calculateHeight () {
      let foodList = this.$els.foodsWrapper.getElementsByClassName('food-list-hook')
      let height = 0
      this.listHeight.push(height)
      for (let i = 0; i < foodList.length; i++) {
        let item = foodList[i]
        height += item.clientHeight
        this.listHeight.push(height)
      }
    }
  },
  components: {
    shopcart
  }
}
</script>

<style lang="stylus">
@import '../../common/stylus/mixin'
.goods
  display flex
  position absolute
  top 174px
  bottom 46px
  width 100%
  overflow hidden
  .menu-wrapper
    flex 0 0 80px
    width 80px
    background #f3f5f7
    .menu-item
      display table
      height 54px
      width 56px
      padding 0 12px
      line-height 14px
      &.current
        position relative
        z-index 10
        margin-top -1px
        background #fff
        font-weight 700
        color red
        .text
          border-none()
      .icon
        display inline-block
        vertical-align top
        width 12px
        height 12px
        margin-right 2px
        background-size 12px 12px
        background-repeat no-repeat
        &.decrease
          bg-image('decrease_3')
        &.discount
          bg-image('discount_3')
        &.guarantee
          bg-image('guarantee_3')
        &.invoice
          bg-image('invoice_3')
        &.special
          bg-image('special_3')
      .text
        display table-cell
        width 56px
        vertical-align middle
        border-1px(rgba(7, 17, 27, 0.1))
        font-size 12px
  .foods-wrapper
    flex 1
    .title
      padding-left 14px
      height 26px
      line-height 26px
      border-left 2px solid #d9dde1
      font-size 12px
      color rgb(147, 153, 159)
      background-color #f3f5f7
    .food-item
      display flex
      margin 18px
      padding-bottom 18px
      border-1px(rgba(7, 17, 27, 0.1))
      &:last-child
        border-none()
        margin-bottom 0
      .icon
        flex 0 0 57px
        margin-right 10px
      .content
        flex 1
        .name
          margin 2px 0 8px 0
          height 14px
          line-height 14px
          font-size 14px
          color rgb(7, 17, 27)
        .desc, .extra
          line-height 10px
          font-size 10px
          color rgb(147, 153, 159)
        .desc
          line-height 12px
          margin-bottom 8px
        .extra
          .count
            margin-right 12px
        .price
          font-weight 700
          line-height 24px
          .now
            margin-right 18px
            font-size 14px
            color rgb(240, 20, 20)
          .old
            text-decoration line-through
            font-size 10px
            color rgb(147, 153, 159)
</style>
